US3324564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level with electrically responsive instrument
Assignee: Empire Level Manufacturing Corp
•
Filing: 1963-04-01
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Granted: 1967-06-13
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Expires: 1983-04-01
Abstract
No abstract record available.
Inventors
- 👤 Donald E Wright
- 👤 Edward R Farber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:08
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/02; G01C9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A LEVEL COMPRISING THE COMBINATION WITH A GRAVITATIONAL INDICATOR COMPRISING AN ELONGATED VIAL CONTAINING LIQUID AND AN ELONGATED BUBBLE MOVABLE IN THE VIAL ALONG A PREDETERMINED PATH, OF A LIGHT SOURCE ELONGATED IN GENERAL PARALLELISM WITH THE VIAL, A SERIES OF PHOTO SENSITIVE RECEPTORS COMPRISING STRIPS OF SEMI-CONDUCTOR MATERIAL AND EXTENDING ALONG SAID PATH AT ONE SIDE OF THE VIAL AND OPPOSITE SAID LIGHT SOURCE, SAID STRIPS BEING ELONGATED ALONG SAID PATH, THE VIAL BEING OFFSET LATERALLY FROM A PLANE INCLUDING THE LIGHT SOURCE AND THE CENTER LINE OF SAID STRIPS, WHEREBY TO LOCATE A MENISCUS AT THE SIDE OF SAID BUBBLE BETWEEN THE LIGHT SOURCE AND A GIVEN STRIP AREA WITH WHICH SAID BUBBLE REGISTERS, AND THEREBY REFRACTS LIGHT FROM SAID SOURCE AND PROGRESSIVELY VARIES IN ACCORDANCE WITH BUBBLE MOVEMENT THE AMOUNT OF LIGHT REACHING SAID GIVEN STRIP AREA FROM SAID SOURCE.
Claim 2
Dependent Claim
143 words
A LEVEL COMPRISING THE COMBINATION WITH A GRAVITATIONAL INDICATOR COMPRISING AN ELONGATED VIAL CONTAINING LIQUID AND AN ELONGATED BUBBLE MOVABLE IN THE VIAL ALONG A PREDETERMINED PATH, OF A LIGHT SOURCE ELONGATED IN GENERAL PARALLELISM WITH THE VIAL, A SERIES OF PHOTO SENSITIVE RECEPTORS COMPRISING STRIPS OF SEMI-CONDUCTOR MATERIAL AND EXTENDING ALONG SAID PATH AT ONE SIDE OF THE VIAL AND OPPOSITE SAID LIGHT SOURCE, SAID STRIPS BEING ELONGATED ALONG SAID PATH, THE VIAL BEING OFFSET LATERALLY FROM A PLANE INCLUDING THE LIGHT SOURCE AND THE CENTER LINE OF SAID STRIPS, WHEREBY TO LOCATE A MENISCUS AT THE SIDE OF SAID BUBBLE BETWEEN THE LIGHT SOURCE AND A GIVEN STRIP AREA WITH WHICH SAID BUBBLE REGISTERS, AND THEREBY REFRACTS LIGHT FROM SAID SOURCE AND PROGRESSIVELY VARIES IN ACCORDANCE WITH BUBBLE MOVEMENT THE AMOUNT OF LIGHT REACHING SAID GIVEN STRIP AREA FROM SAID SOURCE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-12 | 1970-12-12 | 1971-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-12 | 1974-12-12 | 1975-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-12 | 1978-12-12 | 1979-06-13 | $7700.00 | Window Closed / Lapsed |